qgsmodelcomponentgraphicitem.cpp

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/***************************************************************************
                             qgsmodelcomponentgraphicitem.cpp
                             ----------------------------------
    Date                 : March 2020
    Copyright            : (C) 2020 Nyall Dawson
    Email                : nyall dot dawson at gmail dot com
 ***************************************************************************
 *                                                                         *
 *   This program is free software; you can redistribute it and/or modify  *
 *   it under the terms of the GNU General Public License as published by  *
 *   the Free Software Foundation; either version 2 of the License, or     *
 *   (at your option) any later version.                                   *
 *                                                                         *
 ***************************************************************************/
 
#include "qgsmodelcomponentgraphicitem.h"
 
#include "qgsapplication.h"
#include "qgsmessagelog.h"
#include "qgsmodelgraphicitem.h"
#include "qgsmodelgraphicsscene.h"
#include "qgsmodelgraphicsview.h"
#include "qgsmodelgroupboxdefinitionwidget.h"
#include "qgsmodelviewmouseevent.h"
#include "qgsmodelviewtool.h"
#include "qgsprocessingmodelalgorithm.h"
#include "qgsprocessingmodelchildalgorithm.h"
#include "qgsprocessingmodelcomponent.h"
#include "qgsprocessingmodelgroupbox.h"
#include "qgsprocessingmodeloutput.h"
#include "qgsprocessingmodelparameter.h"
#include "qgsprocessingparameters.h"
 
#include <QApplication>
#include <QGraphicsSceneHoverEvent>
#include <QMenu>
#include <QMessageBox>
#include <QPainter>
#include <QPalette>
#include <QPicture>
#include <QString>
#include <QSvgRenderer>
 
#include "moc_qgsmodelcomponentgraphicitem.cpp"
 
using namespace Qt::StringLiterals;

 
QgsModelComponentGraphicItem::QgsModelComponentGraphicItem( QgsProcessingModelComponent *component, QgsProcessingModelAlgorithm *model, QGraphicsItem *parent )
  : QGraphicsObject( parent )
  , mComponent( component )
  , mModel( model )
{
  setAcceptHoverEvents( true );
  setFlag( QGraphicsItem::ItemIsSelectable, true );
  setFlag( QGraphicsItem::ItemSendsGeometryChanges, true );
  setZValue( QgsModelGraphicsScene::ZValues::ModelComponent );
 
  mFont.setPixelSize( 12 );
 
  QSvgRenderer svg( QgsApplication::iconPath( u"mActionEditModelComponent.svg"_s ) );
  QPicture editPicture;
  QPainter painter( &editPicture );
  svg.render( &painter );
  painter.end();
  mEditButton = new QgsModelDesignerFlatButtonGraphicItem( this, editPicture, QPointF( 0, 0 ) );
  connect( mEditButton, &QgsModelDesignerFlatButtonGraphicItem::clicked, this, &QgsModelComponentGraphicItem::editComponent );
 
  QSvgRenderer svg2( QgsApplication::iconPath( u"mActionDeleteModelComponent.svg"_s ) );
  QPicture deletePicture;
  painter.begin( &deletePicture );
  svg2.render( &painter );
  painter.end();
  mDeleteButton = new QgsModelDesignerFlatButtonGraphicItem( this, deletePicture, QPointF( 0, 0 ) );
  connect( mDeleteButton, &QgsModelDesignerFlatButtonGraphicItem::clicked, this, &QgsModelComponentGraphicItem::deleteComponent );
 
  updateButtonPositions();
}
 
QgsModelComponentGraphicItem::Flags QgsModelComponentGraphicItem::flags() const
{
  return QgsModelComponentGraphicItem::Flags();
}
 
QgsModelComponentGraphicItem::~QgsModelComponentGraphicItem() = default;
 
QgsProcessingModelComponent *QgsModelComponentGraphicItem::component()
{
  return mComponent.get();
}
 
const QgsProcessingModelComponent *QgsModelComponentGraphicItem::component() const
{
  return mComponent.get();
}
 
QgsProcessingModelAlgorithm *QgsModelComponentGraphicItem::model()
{
  return mModel;
}
 
const QgsProcessingModelAlgorithm *QgsModelComponentGraphicItem::model() const
{
  return mModel;
}
 
QgsModelGraphicsView *QgsModelComponentGraphicItem::view()
{
  if ( scene()->views().isEmpty() )
    return nullptr;
 
  return qobject_cast<QgsModelGraphicsView *>( scene()->views().first() );
}
 
QFont QgsModelComponentGraphicItem::font() const
{
  return mFont;
}
 
void QgsModelComponentGraphicItem::setFont( const QFont &font )
{
  mFont = font;
  update();
}
 
void QgsModelComponentGraphicItem::moveComponentBy( qreal dx, qreal dy )
{
  setPos( mComponent->position().x() + dx, mComponent->position().y() + dy );
  mComponent->setPosition( pos() );
 
  emit aboutToChange( tr( "Move %1" ).arg( mComponent->description() ) );
  updateStoredComponentPosition( pos(), mComponent->size() );
  emit changed();
 
  emit sizePositionChanged();
  emit updateArrowPaths();
}
 
void QgsModelComponentGraphicItem::previewItemMove( qreal dx, qreal dy )
{
  setPos( mComponent->position().x() + dx, mComponent->position().y() + dy );
  emit updateArrowPaths();
}
 
void QgsModelComponentGraphicItem::setItemRect( QRectF rect )
{
  rect = rect.normalized();
 
  if ( rect.width() < MIN_COMPONENT_WIDTH )
    rect.setWidth( MIN_COMPONENT_WIDTH );
  if ( rect.height() < MIN_COMPONENT_HEIGHT )
    rect.setHeight( MIN_COMPONENT_HEIGHT );
 
  setPos( rect.center() );
  prepareGeometryChange();
 
  emit aboutToChange( tr( "Resize %1" ).arg( mComponent->description() ) );
 
  mComponent->setPosition( pos() );
  mComponent->setSize( rect.size() );
  updateStoredComponentPosition( pos(), mComponent->size() );
 
  updateButtonPositions();
  emit changed();
 
  emit updateArrowPaths();
  emit sizePositionChanged();
}
 
QRectF QgsModelComponentGraphicItem::previewItemRectChange( QRectF rect )
{
  rect = rect.normalized();
 
  if ( rect.width() < MIN_COMPONENT_WIDTH )
    rect.setWidth( MIN_COMPONENT_WIDTH );
  if ( rect.height() < MIN_COMPONENT_HEIGHT )
    rect.setHeight( MIN_COMPONENT_HEIGHT );
 
  setPos( rect.center() );
  prepareGeometryChange();
 
  mTempSize = rect.size();
 
  updateButtonPositions();
  emit updateArrowPaths();
 
  return rect;
}
 
void QgsModelComponentGraphicItem::finalizePreviewedItemRectChange( QRectF )
{
  mComponent->setPosition( pos() );
  prepareGeometryChange();
  mComponent->setSize( mTempSize );
  mTempSize = QSizeF();
 
  emit aboutToChange( tr( "Resize %1" ).arg( mComponent->description() ) );
  updateStoredComponentPosition( pos(), mComponent->size() );
 
  updateButtonPositions();
 
  emit changed();
 
  emit sizePositionChanged();
  emit updateArrowPaths();
}
 
void QgsModelComponentGraphicItem::modelHoverEnterEvent( QgsModelViewMouseEvent *event )
{
  if ( view() && view()->tool() && view()->tool()->allowItemInteraction() )
    updateToolTip( mapFromScene( event->modelPoint() ) );
}
 
void QgsModelComponentGraphicItem::modelHoverMoveEvent( QgsModelViewMouseEvent *event )
{
  if ( view() && view()->tool() && view()->tool()->allowItemInteraction() )
    updateToolTip( mapFromScene( event->modelPoint() ) );
}
 
void QgsModelComponentGraphicItem::modelHoverLeaveEvent( QgsModelViewMouseEvent * )
{
  if ( view() && view()->tool() && view()->tool()->allowItemInteraction() )
  {
    setToolTip( QString() );
    if ( mIsHovering )
    {
      mIsHovering = false;
      update();
      emit repaintArrows();
    }
  }
}
 
void QgsModelComponentGraphicItem::modelDoubleClickEvent( QgsModelViewMouseEvent * )
{
  if ( view() && view()->tool() && view()->tool()->allowItemInteraction() )
    editComponent();
}
 
void QgsModelComponentGraphicItem::mouseDoubleClickEvent( QGraphicsSceneMouseEvent * )
{
  if ( view() && view()->tool() && view()->tool()->allowItemInteraction() )
    editComponent();
}
 
void QgsModelComponentGraphicItem::hoverEnterEvent( QGraphicsSceneHoverEvent *event )
{
  if ( view() && view()->tool() && view()->tool()->allowItemInteraction() )
    updateToolTip( event->pos() );
}
 
void QgsModelComponentGraphicItem::hoverMoveEvent( QGraphicsSceneHoverEvent *event )
{
  if ( view() && view()->tool() && view()->tool()->allowItemInteraction() )
    updateToolTip( event->pos() );
}
 
void QgsModelComponentGraphicItem::hoverLeaveEvent( QGraphicsSceneHoverEvent * )
{
  modelHoverLeaveEvent( nullptr );
}
 
QVariant QgsModelComponentGraphicItem::itemChange( QGraphicsItem::GraphicsItemChange change, const QVariant &value )
{
  switch ( change )
  {
    case QGraphicsItem::ItemSelectedChange:
    {
      emit repaintArrows();
      break;
    }
 
    case QGraphicsItem::ItemSceneChange:
    {
      if ( !mInitialized )
      {
        // ideally would be in constructor, but cannot call virtual methods from that...
        if ( linkPointCount( Qt::TopEdge ) )
        {
          mExpandTopButton = new QgsModelDesignerFoldButtonGraphicItem( this, mComponent->linksCollapsed( Qt::TopEdge ), QPointF( 0, 0 ) );
          connect( mExpandTopButton, &QgsModelDesignerFoldButtonGraphicItem::folded, this, [this]( bool folded ) { fold( Qt::TopEdge, folded ); } );
 
          for ( int idx = 0; idx < linkPointCount( Qt::TopEdge ); ++idx )
          {
            mInSockets.append( new QgsModelDesignerSocketGraphicItem( this, mComponent.get(), idx, QPointF( 0, 0 ), Qt::TopEdge ) );
          }
        }
        if ( linkPointCount( Qt::BottomEdge ) )
        {
          mExpandBottomButton = new QgsModelDesignerFoldButtonGraphicItem( this, mComponent->linksCollapsed( Qt::BottomEdge ), QPointF( 0, 0 ) );
          connect( mExpandBottomButton, &QgsModelDesignerFoldButtonGraphicItem::folded, this, [this]( bool folded ) { fold( Qt::BottomEdge, folded ); } );
 
          for ( int idx = 0; idx < linkPointCount( Qt::BottomEdge ); ++idx )
          {
            mOutSockets.append( new QgsModelDesignerSocketGraphicItem( this, mComponent.get(), idx, QPointF( 0, 0 ), Qt::BottomEdge ) );
          }
        }
        mInitialized = true;
        updateButtonPositions();
      }
      break;
    }
 
    default:
      break;
  }
 
  return QGraphicsObject::itemChange( change, value );
}
 
QRectF QgsModelComponentGraphicItem::boundingRect() const
{
  const QFontMetricsF fm( mFont );
  const int linksAbove = linkPointCount( Qt::TopEdge );
  const int linksBelow = linkPointCount( Qt::BottomEdge );
 
  const double hUp = linksAbove == 0 ? 0 : fm.height() * 1.2 * ( ( mComponent->linksCollapsed( Qt::TopEdge ) ? 0 : linksAbove ) + 2 );
  const double hDown = linksBelow == 0 ? 0 : fm.height() * 1.2 * ( ( mComponent->linksCollapsed( Qt::BottomEdge ) ? 0 : linksBelow ) + 2 );
 
  double outlineSize = 0;
  if ( outlineColor().isValid() )
  {
    outlineSize = RECT_OUTLINE_SIZE + 0.5; // 0.5 for antialiasing
  }
 
  return QRectF(
    -( itemSize().width() ) / 2 - RECT_PEN_SIZE - outlineSize,
    -( itemSize().height() ) / 2 - hUp - RECT_PEN_SIZE - outlineSize,
    itemSize().width() + 2 * RECT_PEN_SIZE + outlineSize * 2,
    itemSize().height() + hDown + hUp + 2 * RECT_PEN_SIZE + outlineSize * 2
  );
}
 
bool QgsModelComponentGraphicItem::contains( const QPointF &point ) const
{
  const QRectF paintingBounds = boundingRect();
  if ( point.x() < paintingBounds.left() + RECT_PEN_SIZE )
    return false;
  if ( point.x() > paintingBounds.right() - RECT_PEN_SIZE )
    return false;
  if ( point.y() < paintingBounds.top() + RECT_PEN_SIZE )
    return false;
  if ( point.y() > paintingBounds.bottom() - RECT_PEN_SIZE )
    return false;
 
  return true;
}
 
void QgsModelComponentGraphicItem::paintBackground( QPainter *painter, const QStyleOptionGraphicsItem *option, QWidget *widget )
{
  const QRectF rect = itemRect();
  QColor color;
  QColor stroke;
  if ( mComponent->color().isValid() )
  {
    color = mComponent->color();
    switch ( state() )
    {
      case Selected:
        color = color.darker( 110 );
        break;
      case Hover:
        color = color.darker( 105 );
        break;
 
      case Normal:
        break;
    }
    stroke = color.darker( 110 );
  }
  else
  {
    color = fillColor( state() );
    stroke = strokeColor( state() );
  }
 
  paintOutline( painter, option, widget );
 
  QPen strokePen = QPen( stroke, 0 ); // 0 width "cosmetic" pen
  strokePen.setStyle( strokeStyle( state() ) );
  painter->setPen( strokePen );
  painter->setBrush( QBrush( color, Qt::SolidPattern ) );
  painter->drawRect( rect );
}
 
void QgsModelComponentGraphicItem::paintOutline( QPainter *painter, const QStyleOptionGraphicsItem *, QWidget * )
{
  const QColor outline = outlineColor();
  if ( outline.isValid() )
  {
    // outline may be sub-pixel sized, which looks ugly without antialiasing.
    const bool wasAntiAliased = painter->testRenderHint( QPainter::RenderHint::Antialiasing );
    painter->setRenderHint( QPainter::RenderHint::Antialiasing );
    QPen strokePen = QPen( outline, RECT_OUTLINE_SIZE );
    strokePen.setJoinStyle( Qt::MiterJoin );
    strokePen.setStyle( strokeStyle( state() ) );
    painter->setPen( strokePen );
    painter->setBrush( Qt::NoBrush );
    const QRectF rect = itemRect();
    painter->drawRect( rect );
    painter->setRenderHint( QPainter::RenderHint::Antialiasing, wasAntiAliased );
  }
}
 
void QgsModelComponentGraphicItem::paint( QPainter *painter, const QStyleOptionGraphicsItem *option, QWidget *widget )
{
  paintBackground( painter, option, widget );
 
  const QRectF rect = itemRect();
  QColor foreColor;
  if ( mComponent->color().isValid() )
  {
    QColor color = mComponent->color();
    switch ( state() )
    {
      case Selected:
        color = color.darker( 110 );
        break;
      case Hover:
        color = color.darker( 105 );
        break;
 
      case Normal:
        break;
    }
    foreColor = color.lightness() > 150 ? QColor( 0, 0, 0 ) : QColor( 255, 255, 255 );
  }
  else
  {
    foreColor = textColor( state() );
  }
  painter->setFont( font() );
  painter->setPen( QPen( foreColor ) );
 
  QString text;
 
  const QSizeF componentSize = itemSize();
 
  const QFontMetricsF fm( font() );
  double h = fm.ascent();
  QPointF pt( -componentSize.width() / 2 + 25, componentSize.height() / 2.0 - h + 1 );
 
  if ( iconPicture().isNull() && iconPixmap().isNull() )
  {
    const QRectF labelRect = QRectF( rect.left() + TEXT_MARGIN, rect.top() + TEXT_MARGIN, rect.width() - 2 * TEXT_MARGIN - mButtonSize.width() - BUTTON_MARGIN, rect.height() - 2 * TEXT_MARGIN );
    text = label();
    painter->drawText( labelRect, Qt::TextWordWrap | titleAlignment(), text );
  }
  else
  {
    const QRectF labelRect = QRectF( rect.left() + 21 + TEXT_MARGIN, rect.top() + TEXT_MARGIN, rect.width() - 2 * TEXT_MARGIN - mButtonSize.width() - BUTTON_MARGIN - 21, rect.height() - 2 * TEXT_MARGIN );
    text = label();
    painter->drawText( labelRect, Qt::TextWordWrap | Qt::AlignVCenter, text );
  }
 
  painter->setPen( QPen( QApplication::palette().color( QPalette::Text ) ) );
 
  if ( linkPointCount( Qt::TopEdge ) )
  {
    h = -( fm.height() * 1.2 );
    h = h - componentSize.height() / 2.0 + 5;
    pt = QPointF( -componentSize.width() / 2 + 25, h );
    painter->drawText( pt, QObject::tr( "In" ) );
    int i = 1;
    if ( !mComponent->linksCollapsed( Qt::TopEdge ) )
    {
      for ( int idx = 0; idx < linkPointCount( Qt::TopEdge ); ++idx )
      {
        text = linkPointText( Qt::TopEdge, idx );
        h = -( fm.height() * 1.2 ) * ( i + 1 );
        h = h - componentSize.height() / 2.0 + 5;
        pt = QPointF( -componentSize.width() / 2 + 33, h );
        painter->drawText( pt, text );
        i += 1;
      }
    }
  }
  if ( linkPointCount( Qt::BottomEdge ) )
  {
    h = fm.height() * 1.1;
    h = h + componentSize.height() / 2.0;
    pt = QPointF( -componentSize.width() / 2 + 25, h );
    painter->drawText( pt, QObject::tr( "Out" ) );
    if ( !mComponent->linksCollapsed( Qt::BottomEdge ) )
    {
      for ( int idx = 0; idx < linkPointCount( Qt::BottomEdge ); ++idx )
      {
        text = linkPointText( Qt::BottomEdge, idx );
        h = fm.height() * 1.2 * ( idx + 2 );
        h = h + componentSize.height() / 2.0;
        pt = QPointF( -componentSize.width() / 2 + 33, h );
        painter->drawText( pt, text );
      }
    }
  }
 
  const QPixmap px = iconPixmap();
  if ( !px.isNull() )
  {
    painter->drawPixmap( QPointF( -( componentSize.width() / 2.0 ) + 3, -8 ), px );
  }
  else
  {
    const QPicture pic = iconPicture();
    if ( !pic.isNull() )
    {
      painter->drawPicture( QPointF( -( componentSize.width() / 2.0 ) + 3, -8 ), pic );
    }
  }
}
 
QRectF QgsModelComponentGraphicItem::itemRect( bool storedRect ) const
{
  if ( storedRect )
  {
    return QRectF( mComponent->position().x() - ( mComponent->size().width() ) / 2.0, mComponent->position().y() - ( mComponent->size().height() ) / 2.0, mComponent->size().width(), mComponent->size().height() );
  }
  else
    return QRectF( -( itemSize().width() ) / 2.0, -( itemSize().height() ) / 2.0, itemSize().width(), itemSize().height() );
}
 
QString QgsModelComponentGraphicItem::truncatedTextForItem( const QString &text ) const
{
  const QFontMetricsF fm( mFont );
  double width = fm.boundingRect( text ).width();
  if ( width < itemSize().width() - 25 - mButtonSize.width() )
    return text;
 
  QString t = text;
  t = t.left( t.length() - 3 ) + QChar( 0x2026 );
  width = fm.boundingRect( t ).width();
  while ( width > itemSize().width() - 25 - mButtonSize.width() )
  {
    if ( t.length() < 5 )
      break;
 
    t = t.left( t.length() - 4 ) + QChar( 0x2026 );
    width = fm.boundingRect( t ).width();
  }
  return t;
}
 
Qt::PenStyle QgsModelComponentGraphicItem::strokeStyle( QgsModelComponentGraphicItem::State ) const
{
  return Qt::SolidLine;
}
 
Qt::Alignment QgsModelComponentGraphicItem::titleAlignment() const
{
  return Qt::AlignLeft;
}
 
QPicture QgsModelComponentGraphicItem::iconPicture() const
{
  return QPicture();
}
 
QPixmap QgsModelComponentGraphicItem::iconPixmap() const
{
  return QPixmap();
}
 
 
void QgsModelComponentGraphicItem::updateButtonPositions()
{
  mEditButton->setPosition( QPointF( itemSize().width() / 2.0 - mButtonSize.width() / 2.0 - BUTTON_MARGIN, itemSize().height() / 2.0 - mButtonSize.height() / 2.0 - BUTTON_MARGIN ) );
  mDeleteButton->setPosition( QPointF( itemSize().width() / 2.0 - mButtonSize.width() / 2.0 - BUTTON_MARGIN, mButtonSize.height() / 2.0 - itemSize().height() / 2.0 + BUTTON_MARGIN ) );
 
  if ( mExpandBottomButton )
  {
    const QPointF pt = linkPoint( Qt::BottomEdge, -1, false );
    mExpandBottomButton->setPosition( QPointF( 0, pt.y() ) );
 
    bool collapsed = mComponent->linksCollapsed( Qt::BottomEdge );
    for ( QgsModelDesignerSocketGraphicItem *socket : std::as_const( mOutSockets ) )
    {
      const QPointF pt = linkPoint( Qt::BottomEdge, socket->index(), false );
      socket->setPosition( pt );
      socket->setVisible( !collapsed );
    }
  }
 
 
  if ( mExpandTopButton )
  {
    const QPointF pt = linkPoint( Qt::TopEdge, -1, true );
    mExpandTopButton->setPosition( QPointF( 0, pt.y() ) );
 
    bool collapsed = mComponent->linksCollapsed( Qt::TopEdge );
    for ( QgsModelDesignerSocketGraphicItem *socket : std::as_const( mInSockets ) )
    {
      const QPointF pt = linkPoint( Qt::TopEdge, socket->index(), true );
      socket->setPosition( pt );
      socket->setVisible( !collapsed );
    }
  }
}
 
 
QSizeF QgsModelComponentGraphicItem::itemSize() const
{
  return !mTempSize.isValid() ? mComponent->size() : mTempSize;
}
 
void QgsModelComponentGraphicItem::updateToolTip( const QPointF &pos )
{
  const bool prevHoverStatus = mIsHovering;
  if ( itemRect().contains( pos ) )
  {
    setToolTip( mLabel );
    mIsHovering = true;
  }
  else
  {
    setToolTip( QString() );
    mIsHovering = false;
  }
  if ( mIsHovering != prevHoverStatus )
  {
    update();
    emit repaintArrows();
  }
}
 
void QgsModelComponentGraphicItem::fold( Qt::Edge edge, bool folded )
{
  emit aboutToChange( !folded ? tr( "Expand Item" ) : tr( "Collapse Item" ) );
  mComponent->setLinksCollapsed( edge, folded );
  // also need to update the model's stored component
 
  // TODO - this is not so nice, consider moving this to model class
  if ( QgsProcessingModelChildAlgorithm *child = dynamic_cast<QgsProcessingModelChildAlgorithm *>( mComponent.get() ) )
  {
    mModel->childAlgorithm( child->childId() ).setLinksCollapsed( edge, folded );
  }
  else if ( QgsProcessingModelParameter *param = dynamic_cast<QgsProcessingModelParameter *>( mComponent.get() ) )
  {
    mModel->parameterComponent( param->parameterName() ).setLinksCollapsed( edge, folded );
  }
  else if ( QgsProcessingModelOutput *output = dynamic_cast<QgsProcessingModelOutput *>( mComponent.get() ) )
  {
    mModel->childAlgorithm( output->childId() ).modelOutput( output->name() ).setLinksCollapsed( edge, folded );
  }
 
  updateButtonPositions();
  prepareGeometryChange();
  emit updateArrowPaths();
  emit changed();
  update();
}
 
QString QgsModelComponentGraphicItem::label() const
{
  return mLabel;
}
 
void QgsModelComponentGraphicItem::setLabel( const QString &label )
{
  mLabel = label;
  update();
}
 
QgsModelComponentGraphicItem::State QgsModelComponentGraphicItem::state() const
{
  if ( isSelected() )
    return Selected;
  else if ( mIsHovering )
    return Hover;
  else
    return Normal;
}
 
int QgsModelComponentGraphicItem::linkPointCount( Qt::Edge ) const
{
  return 0;
}
 
QString QgsModelComponentGraphicItem::linkPointText( Qt::Edge, int ) const
{
  return QString();
}
 
QPointF QgsModelComponentGraphicItem::linkPoint( Qt::Edge edge, int index, bool incoming ) const
{
  switch ( edge )
  {
    case Qt::BottomEdge:
    {
      if ( linkPointCount( Qt::BottomEdge ) )
      {
        double offsetX = 25;
        if ( mComponent->linksCollapsed( Qt::BottomEdge ) )
        {
          offsetX = 17;
        }
        const int pointIndex = !mComponent->linksCollapsed( Qt::BottomEdge ) ? index : -1;
        const QString text = truncatedTextForItem( linkPointText( Qt::BottomEdge, index ) );
        const QFontMetricsF fm( mFont );
        const double w = fm.boundingRect( text ).width();
        const double h = fm.height() * 1.2 * ( pointIndex + 1 ) + fm.height() / 2.0;
        const double y = h + itemSize().height() / 2.0 + 6.4;
        const double x = !mComponent->linksCollapsed( Qt::BottomEdge ) ? ( -itemSize().width() / 2 + 33 + w + 10 ) : 10.4;
        return QPointF( incoming ? -itemSize().width() / 2 + offsetX : x, y );
      }
      break;
    }
 
    case Qt::TopEdge:
    {
      if ( linkPointCount( Qt::TopEdge ) )
      {
        double offsetX = 25;
        int paramIndex = index;
        if ( mComponent->linksCollapsed( Qt::TopEdge ) )
        {
          paramIndex = -1;
          offsetX = 17;
        }
        const QFontMetricsF fm( mFont );
        const QString text = truncatedTextForItem( linkPointText( Qt::TopEdge, index ) );
        const double w = fm.boundingRect( text ).width();
        double h = -( fm.height() * 1.2 ) * ( paramIndex + 2 ) - fm.height() / 2.0 + 8;
        h = h - itemSize().height() / 2.0;
        return QPointF( incoming ? -itemSize().width() / 2 + offsetX : ( !mComponent->linksCollapsed( Qt::TopEdge ) ? ( -itemSize().width() / 2 + 33 + w + 5 ) : 10 ), h );
      }
      break;
    }
    case Qt::LeftEdge:
    case Qt::RightEdge:
      break;
  }
 
  return QPointF();
}
 
QPointF QgsModelComponentGraphicItem::calculateAutomaticLinkPoint( QgsModelComponentGraphicItem *other, Qt::Edge &edge ) const
{
  // find closest edge to other item
  const QgsRectangle otherRect( other->itemRect().translated( other->pos() ) );
 
  const QPointF leftPoint = pos() + QPointF( -itemSize().width() / 2.0, 0 );
  const double distLeft = otherRect.distance( QgsPointXY( leftPoint ) );
 
  const QPointF rightPoint = pos() + QPointF( itemSize().width() / 2.0, 0 );
  const double distRight = otherRect.distance( QgsPointXY( rightPoint ) );
 
  const QPointF topPoint = pos() + QPointF( 0, -itemSize().height() / 2.0 );
  const double distTop = otherRect.distance( QgsPointXY( topPoint ) );
 
  const QPointF bottomPoint = pos() + QPointF( 0, itemSize().height() / 2.0 );
  const double distBottom = otherRect.distance( QgsPointXY( bottomPoint ) );
 
  if ( distLeft <= distRight && distLeft <= distTop && distLeft <= distBottom )
  {
    edge = Qt::LeftEdge;
    return leftPoint;
  }
  else if ( distRight <= distTop && distRight <= distBottom )
  {
    edge = Qt::RightEdge;
    return rightPoint;
  }
  else if ( distBottom <= distTop )
  {
    edge = Qt::BottomEdge;
    return bottomPoint;
  }
  else
  {
    edge = Qt::TopEdge;
    return topPoint;
  }
}
 
QPointF QgsModelComponentGraphicItem::calculateAutomaticLinkPoint( const QPointF &point, Qt::Edge &edge ) const
{
  // find closest edge to other point
  const QgsPointXY otherPt( point );
  const QPointF leftPoint = pos() + QPointF( -itemSize().width() / 2.0, 0 );
  const double distLeft = otherPt.distance( QgsPointXY( leftPoint ) );
 
  const QPointF rightPoint = pos() + QPointF( itemSize().width() / 2.0, 0 );
  const double distRight = otherPt.distance( QgsPointXY( rightPoint ) );
 
  const QPointF topPoint = pos() + QPointF( 0, -itemSize().height() / 2.0 );
  const double distTop = otherPt.distance( QgsPointXY( topPoint ) );
 
  const QPointF bottomPoint = pos() + QPointF( 0, itemSize().height() / 2.0 );
  const double distBottom = otherPt.distance( QgsPointXY( bottomPoint ) );
 
  if ( distLeft <= distRight && distLeft <= distTop && distLeft <= distBottom )
  {
    edge = Qt::LeftEdge;
    return leftPoint;
  }
  else if ( distRight <= distTop && distRight <= distBottom )
  {
    edge = Qt::RightEdge;
    return rightPoint;
  }
  else if ( distBottom <= distTop )
  {
    edge = Qt::BottomEdge;
    return bottomPoint;
  }
  else
  {
    edge = Qt::TopEdge;
    return topPoint;
  }
}
 
QgsModelDesignerSocketGraphicItem *QgsModelComponentGraphicItem::outSocketAt( int index ) const
{
  if ( index < 0 || index >= mOutSockets.size() )
  {
    return nullptr;
  }
  return mOutSockets.at( index );
}
 
QList<QgsModelArrowItem *> QgsModelComponentGraphicItem::incomingArrows()
{
  const QList<QGraphicsItem *> allItems = scene()->items();
  QList<QgsModelArrowItem *> arrows;
  for ( QGraphicsItem *item : allItems )
  {
    if ( auto arrowItem = dynamic_cast< QgsModelArrowItem * >( item ) )
    {
      if ( arrowItem->endItem() == this )
      {
        arrows << arrowItem;
      }
    }
  }
  return arrows;
}
 
QList<QgsModelArrowItem *> QgsModelComponentGraphicItem::outgoingArrows()
{
  const QList<QGraphicsItem *> allItems = scene()->items();
  QList<QgsModelArrowItem *> arrows;
  for ( QGraphicsItem *item : allItems )
  {
    if ( auto arrowItem = dynamic_cast< QgsModelArrowItem * >( item ) )
    {
      if ( arrowItem->startItem() == this )
      {
        arrows << arrowItem;
      }
    }
  }
  return arrows;
}
 
void QgsModelComponentGraphicItem::registerWidgetContextGenerator( QgsProcessingWidgetContextGenerator *generator )
{
  mWidgetContextGenerator = generator;
}
 
QgsProcessingParameterWidgetContext QgsModelComponentGraphicItem::createWidgetContext()
{
  if ( mWidgetContextGenerator )
  {
    return mWidgetContextGenerator->createWidgetContext();
  }
  return QgsProcessingParameterWidgetContext();
}
 
QgsModelParameterGraphicItem::QgsModelParameterGraphicItem( QgsProcessingModelParameter *parameter, QgsProcessingModelAlgorithm *model, QGraphicsItem *parent )
  : QgsModelComponentGraphicItem( parameter, model, parent )
{
  QSvgRenderer svg( QgsApplication::iconPath( u"mIconModelInput.svg"_s ) );
  QPainter painter( &mPicture );
  svg.render( &painter );
  painter.end();
 
  if ( const QgsProcessingParameterDefinition *parameterDefinition = model->parameterDefinition( parameter->parameterName() ) )
    setLabel( parameterDefinition->description() );
  else
    setLabel( QObject::tr( "Error (%1)" ).arg( parameter->parameterName() ) );
}
 
void QgsModelParameterGraphicItem::contextMenuEvent( QGraphicsSceneContextMenuEvent *event )
{
  QMenu *popupmenu = new QMenu( event->widget() );
  QAction *removeAction = popupmenu->addAction( QObject::tr( "Remove" ) );
  connect( removeAction, &QAction::triggered, this, &QgsModelParameterGraphicItem::deleteComponent );
  QAction *editAction = popupmenu->addAction( QObject::tr( "Edit…" ) );
  connect( editAction, &QAction::triggered, this, &QgsModelParameterGraphicItem::editComponent );
  QAction *editCommentAction = popupmenu->addAction( component()->comment()->description().isEmpty() ? QObject::tr( "Add Comment…" ) : QObject::tr( "Edit Comment…" ) );
  connect( editCommentAction, &QAction::triggered, this, &QgsModelParameterGraphicItem::editComment );
 
  popupmenu->exec( event->screenPos() );
}
 
QColor QgsModelParameterGraphicItem::fillColor( QgsModelComponentGraphicItem::State state ) const
{
  QColor c( 238, 242, 131 );
  switch ( state )
  {
    case Selected:
      c = c.darker( 110 );
      break;
    case Hover:
      c = c.darker( 105 );
      break;
 
    case Normal:
      break;
  }
  return c;
}
 
QColor QgsModelParameterGraphicItem::strokeColor( QgsModelComponentGraphicItem::State state ) const
{
  switch ( state )
  {
    case Selected:
      return QColor( 116, 113, 68 );
    case Hover:
    case Normal:
      return QColor( 234, 226, 118 );
  }
  return QColor();
}
 
QColor QgsModelParameterGraphicItem::textColor( QgsModelComponentGraphicItem::State ) const
{
  return Qt::black;
}
 
QPicture QgsModelParameterGraphicItem::iconPicture() const
{
  return mPicture;
}
 
int QgsModelParameterGraphicItem::linkPointCount( Qt::Edge edge ) const
{
  switch ( edge )
  {
    case Qt::BottomEdge:
      return 1;
    case Qt::TopEdge:
    case Qt::LeftEdge:
    case Qt::RightEdge:
      break;
  }
 
  return 0;
}
 
QString QgsModelParameterGraphicItem::linkPointText( Qt::Edge, int index ) const
{
  if ( index < 0 )
  {
    return QString();
  }
 
  if ( const QgsProcessingModelParameter *parameter = dynamic_cast< const QgsProcessingModelParameter * >( component() ) )
  {
    QString text = this->model()->parameterDefinition( parameter->parameterName() )->type();
 
    // Getting the default value to append to the box name
    if ( const QgsProcessingParameterDefinition *paramDef = this->model()->parameterDefinition( parameter->parameterName() ) )
    {
      const QVariant paramValue = paramDef->defaultValue();
 
      if ( paramValue.isValid() )
      {
        text += ": " + paramDef->userFriendlyString( paramValue );
      }
    }
    return truncatedTextForItem( text );
  }
 
  return QString();
}
 
QColor QgsModelParameterGraphicItem::linkColor( Qt::Edge /* unused in this implementation because parameters only have a bottom edge */, int index ) const
{
  if ( index < 0 )
  {
    return FALLBACK_COLOR;
  }
 
  if ( const QgsProcessingModelParameter *parameter = dynamic_cast< const QgsProcessingModelParameter * >( component() ) )
  {
    if ( const QgsProcessingParameterDefinition *parameterDefinition = model()->parameterDefinition( parameter->parameterName() ) )
    {
      return parameterDefinition->modelColor();
    }
  }
 
  return FALLBACK_COLOR;
}
 
void QgsModelParameterGraphicItem::updateStoredComponentPosition( const QPointF &pos, const QSizeF &size )
{
  if ( QgsProcessingModelParameter *param = dynamic_cast<QgsProcessingModelParameter *>( component() ) )
  {
    model()->parameterComponent( param->parameterName() ).setPosition( pos );
    model()->parameterComponent( param->parameterName() ).setSize( size );
  }
}
 
bool QgsModelParameterGraphicItem::canDeleteComponent()
{
  if ( const QgsProcessingModelParameter *param = dynamic_cast<const QgsProcessingModelParameter *>( component() ) )
  {
    if ( model()->childAlgorithmsDependOnParameter( param->parameterName() ) )
    {
      return false;
    }
    else if ( model()->otherParametersDependOnParameter( param->parameterName() ) )
    {
      return false;
    }
    else
    {
      return true;
    }
  }
  return false;
}
 
void QgsModelParameterGraphicItem::deleteComponent()
{
  if ( const QgsProcessingModelParameter *param = dynamic_cast<const QgsProcessingModelParameter *>( component() ) )
  {
    if ( model()->childAlgorithmsDependOnParameter( param->parameterName() ) )
    {
      QMessageBox::warning(
        nullptr,
        QObject::tr( "Could not remove input" ),
        QObject::tr(
          "Algorithms depend on the selected input.\n"
          "Remove them before trying to remove it."
        )
      );
    }
    else if ( model()->otherParametersDependOnParameter( param->parameterName() ) )
    {
      QMessageBox::warning(
        nullptr,
        QObject::tr( "Could not remove input" ),
        QObject::tr(
          "Other inputs depend on the selected input.\n"
          "Remove them before trying to remove it."
        )
      );
    }
    else
    {
      emit aboutToChange( tr( "Delete Input %1" ).arg( param->description() ) );
      model()->removeModelParameter( param->parameterName() );
      emit changed();
      emit requestModelRepaint();
    }
  }
}
 
 
QgsModelChildAlgorithmGraphicItem::QgsModelChildAlgorithmGraphicItem( QgsProcessingModelChildAlgorithm *child, QgsProcessingModelAlgorithm *model, QGraphicsItem *parent )
  : QgsModelComponentGraphicItem( child, model, parent )
{
  if ( child->algorithm() && !child->algorithm()->svgIconPath().isEmpty() )
  {
    QSvgRenderer svg( child->algorithm()->svgIconPath() );
    const QSizeF size = svg.defaultSize();
    QPainter painter( &mPicture );
    painter.scale( 16.0 / size.width(), 16.0 / size.width() );
    svg.render( &painter );
    painter.end();
  }
  else if ( child->algorithm() )
  {
    mPixmap = child->algorithm()->icon().pixmap( 15, 15 );
  }
 
  setLabel( child->description() );
 
  QStringList issues;
  mIsValid = model->validateChildAlgorithm( child->childId(), issues );
}
 
void QgsModelChildAlgorithmGraphicItem::contextMenuEvent( QGraphicsSceneContextMenuEvent *event )
{
  QMenu *popupmenu = new QMenu( event->widget() );
 
  if ( isSelected() )
  {
    QAction *runSelectedStepsAction = popupmenu->addAction( QObject::tr( "Run Selected Steps…" ) );
    runSelectedStepsAction->setIcon( QgsApplication::getThemeIcon( u"mActionRunSelected.svg"_s ) );
    connect( runSelectedStepsAction, &QAction::triggered, this, &QgsModelChildAlgorithmGraphicItem::runSelected );
  }
 
  QAction *runFromHereAction = popupmenu->addAction( QObject::tr( "Run from Here…" ) );
  runFromHereAction->setIcon( QgsApplication::getThemeIcon( u"mActionStart.svg"_s ) );
  connect( runFromHereAction, &QAction::triggered, this, &QgsModelChildAlgorithmGraphicItem::runFromHere );
 
  popupmenu->addSeparator();
 
  QAction *removeAction = popupmenu->addAction( QObject::tr( "Remove" ) );
  connect( removeAction, &QAction::triggered, this, &QgsModelChildAlgorithmGraphicItem::deleteComponent );
  QAction *editAction = popupmenu->addAction( QObject::tr( "Edit…" ) );
  connect( editAction, &QAction::triggered, this, &QgsModelChildAlgorithmGraphicItem::editComponent );
  QAction *editCommentAction = popupmenu->addAction( component()->comment()->description().isEmpty() ? QObject::tr( "Add Comment…" ) : QObject::tr( "Edit Comment…" ) );
  connect( editCommentAction, &QAction::triggered, this, &QgsModelParameterGraphicItem::editComment );
  popupmenu->addSeparator();
 
  if ( const QgsProcessingModelChildAlgorithm *child = dynamic_cast<const QgsProcessingModelChildAlgorithm *>( component() ) )
  {
    if ( !child->isActive() )
    {
      QAction *activateAction = popupmenu->addAction( QObject::tr( "Activate" ) );
      connect( activateAction, &QAction::triggered, this, &QgsModelChildAlgorithmGraphicItem::activateAlgorithm );
    }
    else
    {
      QAction *deactivateAction = popupmenu->addAction( QObject::tr( "Deactivate" ) );
      connect( deactivateAction, &QAction::triggered, this, &QgsModelChildAlgorithmGraphicItem::deactivateAlgorithm );
    }
 
    // only show the "View Output Layers" action for algorithms which create layers
    if ( const QgsProcessingAlgorithm *algorithm = child->algorithm() )
    {
      const QList<const QgsProcessingParameterDefinition *> outputParams = algorithm->destinationParameterDefinitions();
      if ( !outputParams.isEmpty() )
      {
        popupmenu->addSeparator();
        QAction *viewOutputLayersAction = popupmenu->addAction( QObject::tr( "View Output Layers" ) );
        viewOutputLayersAction->setIcon( QgsApplication::getThemeIcon( u"mActionShowSelectedLayers.svg"_s ) );
        connect( viewOutputLayersAction, &QAction::triggered, this, &QgsModelChildAlgorithmGraphicItem::showPreviousResults );
        // enable this action only when the child succeeded
        switch ( mResults.executionStatus() )
        {
          case Qgis::ProcessingModelChildAlgorithmExecutionStatus::NotExecuted:
          case Qgis::ProcessingModelChildAlgorithmExecutionStatus::Failed:
            viewOutputLayersAction->setEnabled( false );
            break;
 
          case Qgis::ProcessingModelChildAlgorithmExecutionStatus::Success:
            break;
        }
      }
    }
 
    QAction *viewLogAction = popupmenu->addAction( QObject::tr( "View Log…" ) );
    connect( viewLogAction, &QAction::triggered, this, &QgsModelChildAlgorithmGraphicItem::showLog );
    // enable this action even when the child failed
    switch ( mResults.executionStatus() )
    {
      case Qgis::ProcessingModelChildAlgorithmExecutionStatus::NotExecuted:
        viewLogAction->setEnabled( false );
        break;
 
      case Qgis::ProcessingModelChildAlgorithmExecutionStatus::Success:
      case Qgis::ProcessingModelChildAlgorithmExecutionStatus::Failed:
        break;
    }
  }
 
  popupmenu->exec( event->screenPos() );
}
 
QColor QgsModelChildAlgorithmGraphicItem::fillColor( QgsModelComponentGraphicItem::State state ) const
{
  QColor c;
 
  if ( mIsValid )
    c = QColor( 255, 255, 255 );
  else
    c = QColor( 208, 0, 0 );
 
  switch ( state )
  {
    case Selected:
      c = c.darker( 110 );
      break;
    case Hover:
      c = c.darker( 105 );
      break;
 
    case Normal:
      break;
  }
  return c;
}
 
QColor QgsModelChildAlgorithmGraphicItem::strokeColor( QgsModelComponentGraphicItem::State state ) const
{
  switch ( state )
  {
    case Selected:
      return mIsValid ? QColor( 50, 50, 50 ) : QColor( 80, 0, 0 );
    case Hover:
    case Normal:
      return mIsValid ? Qt::gray : QColor( 134, 0, 0 );
  }
  return QColor();
}
 
QColor QgsModelChildAlgorithmGraphicItem::textColor( QgsModelComponentGraphicItem::State ) const
{
  return mIsValid ? ( qgis::down_cast<const QgsProcessingModelChildAlgorithm *>( component() )->isActive() ? Qt::black : Qt::gray ) : QColor( 255, 255, 255 );
}
 
QColor QgsModelChildAlgorithmGraphicItem::outlineColor() const
{
  if ( mOutdated )
  {
    return QColor( 150, 150, 0 );
  }
 
  switch ( mResults.executionStatus() )
  {
    case Qgis::ProcessingModelChildAlgorithmExecutionStatus::NotExecuted:
      if ( mStarted )
      {
        return QColor( 150, 150, 150 );
      }
      return QColor();
    case Qgis::ProcessingModelChildAlgorithmExecutionStatus::Success:
      return QColor( 55, 160, 55 );
    case Qgis::ProcessingModelChildAlgorithmExecutionStatus::Failed:
      return QColor( 208, 0, 0 );
  }
  BUILTIN_UNREACHABLE
}
 
QPixmap QgsModelChildAlgorithmGraphicItem::iconPixmap() const
{
  return mPixmap;
}
 
QPicture QgsModelChildAlgorithmGraphicItem::iconPicture() const
{
  return mPicture;
}
 
int QgsModelChildAlgorithmGraphicItem::linkPointCount( Qt::Edge edge ) const
{
  if ( const QgsProcessingModelChildAlgorithm *child = dynamic_cast<const QgsProcessingModelChildAlgorithm *>( component() ) )
  {
    if ( !child->algorithm() )
      return 0;
 
    switch ( edge )
    {
      case Qt::BottomEdge:
        return child->algorithm()->outputDefinitions().size();
      case Qt::TopEdge:
      {
        QgsProcessingParameterDefinitions params = child->algorithm()->parameterDefinitions();
        params.erase(
          std::remove_if( params.begin(), params.end(), []( const QgsProcessingParameterDefinition *param ) { return param->flags() & Qgis::ProcessingParameterFlag::Hidden || param->isDestination(); } ),
          params.end()
        );
        return params.size();
      }
 
      case Qt::LeftEdge:
      case Qt::RightEdge:
        break;
    }
  }
  return 0;
}
 
QColor QgsModelComponentGraphicItem::linkColor( Qt::Edge edge, int index ) const
{
  if ( const QgsProcessingModelChildAlgorithm *child = dynamic_cast<const QgsProcessingModelChildAlgorithm *>( component() ) )
  {
    if ( !child->algorithm() )
    {
      return FALLBACK_COLOR;
    }
 
    switch ( edge )
    {
      case Qt::BottomEdge:
      {
        if ( index <= child->algorithm()->outputDefinitions().size() - 1 )
        {
          return child->algorithm()->outputDefinitions().at( index )->modelColor();
        }
        return FALLBACK_COLOR;
      }
      case Qt::TopEdge:
      {
        QgsProcessingParameterDefinitions params = child->algorithm()->parameterDefinitions();
 
        if ( index <= params.size() - 1 )
        {
          return params.at( index )->modelColor();
        }
 
        return FALLBACK_COLOR;
      }
 
      case Qt::LeftEdge:
      case Qt::RightEdge:
        break;
    }
  }
 
  return FALLBACK_COLOR;
}
 
QString QgsModelChildAlgorithmGraphicItem::linkPointText( Qt::Edge edge, int index ) const
{
  if ( index < 0 )
    return QString();
 
  if ( const QgsProcessingModelChildAlgorithm *child = dynamic_cast<const QgsProcessingModelChildAlgorithm *>( component() ) )
  {
    if ( !child->algorithm() )
      return QString();
 
    switch ( edge )
    {
      case Qt::BottomEdge:
      {
        if ( index >= child->algorithm()->outputDefinitions().length() )
        {
          // something goes wrong and tried to link to an not existing output
          QgsMessageLog::logMessage( tr( "Cannot link output for child: %1" ).arg( child->algorithm()->name() ), "QgsModelChildAlgorithmGraphicItem", Qgis::MessageLevel::Warning, true );
          return QString();
        }
 
        const QgsProcessingOutputDefinition *output = child->algorithm()->outputDefinitions().at( index );
        QString title = output->description();
        return truncatedTextForItem( title );
      }
 
      case Qt::TopEdge:
      {
        QgsProcessingParameterDefinitions params = child->algorithm()->parameterDefinitions();
        params.erase(
          std::remove_if( params.begin(), params.end(), []( const QgsProcessingParameterDefinition *param ) { return param->flags() & Qgis::ProcessingParameterFlag::Hidden || param->isDestination(); } ),
          params.end()
        );
 
        if ( index >= params.length() )
        {
          // something goes wrong and tried to link to an not existing source parameter
          QgsMessageLog::logMessage( tr( "Cannot link source for child: %1" ).arg( child->algorithm()->name() ), "QgsModelChildAlgorithmGraphicItem", Qgis::MessageLevel::Warning, true );
          return QString();
        }
 
        const QgsProcessingParameterDefinition *param = params.at( index );
        QString name = param->name();
        QString title = param->description();
        QgsProcessingModelChildParameterSources paramSources = child->parameterSources().value( name );
        QString parameterValueAsString;
 
        if ( !paramSources.empty() )
        {
          QgsProcessingModelChildParameterSource firstParameterSource = paramSources[0];
 
          switch ( firstParameterSource.source() )
          {
            case Qgis::ProcessingModelChildParameterSource::ChildOutput:
              parameterValueAsString = u": %1"_s.arg( firstParameterSource.friendlyIdentifier( const_cast<QgsProcessingModelAlgorithm *>( model() ) ) );
              break;
 
            case Qgis::ProcessingModelChildParameterSource::Expression:
              parameterValueAsString = u": %1"_s.arg( firstParameterSource.expression() );
              break;
 
            case Qgis::ProcessingModelChildParameterSource::ExpressionText:
              Q_NOWARN_DEPRECATED_PUSH
              parameterValueAsString = u": %1"_s.arg( firstParameterSource.expressionText() );
              Q_NOWARN_DEPRECATED_POP
              break;
 
            case Qgis::ProcessingModelChildParameterSource::ModelOutput:
              parameterValueAsString = u": <%1>"_s.arg( firstParameterSource.friendlyIdentifier( const_cast<QgsProcessingModelAlgorithm *>( model() ) ) );
              break;
 
            case Qgis::ProcessingModelChildParameterSource::ModelParameter:
            {
              const QString friendlyName = firstParameterSource.friendlyIdentifier( const_cast<QgsProcessingModelAlgorithm *>( model() ) );
              parameterValueAsString = friendlyName.isEmpty() ? u":"_s : u": <%1>"_s.arg( friendlyName );
              break;
            }
 
            case Qgis::ProcessingModelChildParameterSource::StaticValue:
              const QVariant paramValue = paramSources[0].staticValue();
              parameterValueAsString = u": %1"_s.arg( param->userFriendlyString( paramValue ) );
          }
          title += parameterValueAsString;
        }
 
        return truncatedTextForItem( title );
      }
 
      case Qt::LeftEdge:
      case Qt::RightEdge:
        break;
    }
  }
  return QString();
}
 
void QgsModelChildAlgorithmGraphicItem::updateStoredComponentPosition( const QPointF &pos, const QSizeF &size )
{
  if ( QgsProcessingModelChildAlgorithm *child = dynamic_cast<QgsProcessingModelChildAlgorithm *>( component() ) )
  {
    model()->childAlgorithm( child->childId() ).setPosition( pos );
    model()->childAlgorithm( child->childId() ).setSize( size );
  }
}
 
bool QgsModelChildAlgorithmGraphicItem::canDeleteComponent()
{
  if ( const QgsProcessingModelChildAlgorithm *child = dynamic_cast<const QgsProcessingModelChildAlgorithm *>( component() ) )
  {
    return model()->dependentChildAlgorithms( child->childId() ).empty();
  }
  return false;
}
 
void QgsModelChildAlgorithmGraphicItem::setResults( const QgsProcessingModelChildAlgorithmResult &results )
{
  if ( mResults == results )
    return;
 
  mOutdated = false;
  const QList< QgsModelArrowItem * > arrows = outgoingArrows();
  if ( results.executionStatus() == Qgis::ProcessingModelChildAlgorithmExecutionStatus::NotExecuted )
  {
    for ( QgsModelArrowItem *arrow : arrows )
    {
      arrow->setShowBadge( false );
    }
  }
  else
  {
    if ( const QgsProcessingModelChildAlgorithm *child = dynamic_cast<const QgsProcessingModelChildAlgorithm *>( component() ) )
    {
      if ( const QgsProcessingAlgorithm *algorithm = child->algorithm() )
      {
        const QVariantMap outputs = results.outputs();
        for ( auto it = outputs.constBegin(); it != outputs.constEnd(); ++it )
        {
          // don't show badges for output layers, these will just be the internal layer identifiers and we have logic elsewhere
          // to show actually useful information in the badges (feature counts)
          if ( const QgsProcessingOutputDefinition *outputDefinition = algorithm->outputDefinition( it.key() ); outputDefinition && outputDefinition->isMapLayer() )
            continue;
 
          const int index = indexForOutput( it.key() );
          if ( index >= 0 )
          {
            for ( QgsModelArrowItem *arrow : arrows )
            {
              if ( arrow->startIndex() == index && arrow->startEdge() == Qt::BottomEdge )
              {
                arrow->setShowBadge( true );
                arrow->badgeItem()->setValue( it.value() );
              }
            }
          }
        }
      }
    }
  }
 
  mResults = results;
  mStarted = false;
  update();
  emit updateArrowPaths();
}
 
void QgsModelChildAlgorithmGraphicItem::setSourceFeatureCount( const QString &parameterName, long long featureCount )
{
  const int index = indexForInput( parameterName );
  if ( index < 0 )
    return;
 
  const QList< QgsModelArrowItem * > arrows = incomingArrows();
  for ( QgsModelArrowItem *arrow : arrows )
  {
    if ( arrow->endIndex() == index && arrow->endEdge() == Qt::TopEdge )
    {
      arrow->setShowBadge( true );
      arrow->badgeItem()->setValue( featureCount );
    }
  }
}
 
void QgsModelChildAlgorithmGraphicItem::setSinkFeatureCount( const QString &outputName, long long featureCount )
{
  const int index = indexForOutput( outputName );
  if ( index < 0 )
    return;
 
  const QList< QgsModelArrowItem * > arrows = outgoingArrows();
  for ( QgsModelArrowItem *arrow : arrows )
  {
    if ( arrow->startIndex() == index && arrow->startEdge() == Qt::BottomEdge )
    {
      arrow->setShowBadge( true );
      arrow->badgeItem()->setValue( featureCount );
    }
  }
}
 
void QgsModelChildAlgorithmGraphicItem::setProgress( double progress )
{
  if ( mProgress == progress )
    return;
 
  mProgress = progress;
  update();
}
 
void QgsModelChildAlgorithmGraphicItem::setStarted()
{
  mStarted = true;
  update();
}
 
void QgsModelChildAlgorithmGraphicItem::setOutdated()
{
  mOutdated = true;
  update();
}
 
int QgsModelChildAlgorithmGraphicItem::indexForInput( const QString &parameterName ) const
{
  if ( const QgsProcessingModelChildAlgorithm *child = dynamic_cast<const QgsProcessingModelChildAlgorithm *>( component() ) )
  {
    if ( const QgsProcessingAlgorithm *algorithm = child->algorithm() )
    {
      return QgsProcessingUtils::parameterDefinitionIndex( algorithm, parameterName );
    }
  }
  return -1;
}
 
int QgsModelChildAlgorithmGraphicItem::indexForOutput( const QString &output ) const
{
  if ( const QgsProcessingModelChildAlgorithm *child = dynamic_cast<const QgsProcessingModelChildAlgorithm *>( component() ) )
  {
    if ( const QgsProcessingAlgorithm *algorithm = child->algorithm() )
    {
      return QgsProcessingUtils::outputDefinitionIndex( algorithm, output );
    }
  }
  return -1;
}
 
void QgsModelChildAlgorithmGraphicItem::paintBackground( QPainter *painter, const QStyleOptionGraphicsItem *option, QWidget *widget )
{
  if ( mProgress < 0 )
  {
    QgsModelComponentGraphicItem::paintBackground( painter, option, widget );
    return;
  }
 
  paintOutline( painter, option, widget );
 
  const QRectF rect = itemRect();
  QColor color;
  QColor stroke;
  if ( component()->color().isValid() )
  {
    color = component()->color();
    switch ( state() )
    {
      case Selected:
        color = color.darker( 110 );
        break;
      case Hover:
        color = color.darker( 105 );
        break;
 
      case Normal:
        break;
    }
    stroke = color.darker( 110 );
  }
  else
  {
    color = fillColor( state() );
    stroke = strokeColor( state() );
  }
 
  QPen strokePen = QPen( stroke, 0 );
  strokePen.setStyle( strokeStyle( state() ) );
  painter->setPen( strokePen );
 
  const QColor colorLeft = color.darker( 120 );
  QColor colorRight = color;
 
  constexpr double fadeSize = 5;
  const double fadeSizeProportionRect = fadeSize / rect.width();
 
  if ( mProgress < 98 )
  {
    QLinearGradient gradient( rect.topLeft(), rect.topRight() );
    gradient.setColorAt( 0.0, colorLeft );
    gradient.setColorAt( std::max( 0.0, mProgress / 100 - fadeSizeProportionRect / 2 ), colorLeft );
    gradient.setColorAt( std::min( 1.0, mProgress / 100 + fadeSizeProportionRect / 2 ), colorRight );
    gradient.setColorAt( 1.0, colorRight );
 
    painter->setBrush( QBrush( gradient ) );
  }
  else
  {
    painter->setBrush( QBrush( colorLeft ) );
  }
  painter->drawRect( rect );
}
 
void QgsModelChildAlgorithmGraphicItem::deleteComponent()
{
  if ( const QgsProcessingModelChildAlgorithm *child = dynamic_cast<const QgsProcessingModelChildAlgorithm *>( component() ) )
  {
    emit aboutToChange( tr( "Remove %1" ).arg( child->algorithm() ? child->algorithm()->displayName() : tr( "Algorithm" ) ) );
    if ( !model()->removeChildAlgorithm( child->childId() ) )
    {
      QMessageBox::warning(
        nullptr,
        QObject::tr( "Could not remove algorithm" ),
        QObject::tr(
          "Other algorithms depend on the selected one.\n"
          "Remove them before trying to remove it."
        )
      );
    }
    else
    {
      emit changed();
      emit requestModelRepaint();
    }
  }
}
 
void QgsModelChildAlgorithmGraphicItem::deactivateAlgorithm()
{
  if ( const QgsProcessingModelChildAlgorithm *child = dynamic_cast<const QgsProcessingModelChildAlgorithm *>( component() ) )
  {
    model()->deactivateChildAlgorithm( child->childId() );
    emit requestModelRepaint();
  }
}
 
void QgsModelChildAlgorithmGraphicItem::activateAlgorithm()
{
  if ( const QgsProcessingModelChildAlgorithm *child = dynamic_cast<const QgsProcessingModelChildAlgorithm *>( component() ) )
  {
    if ( model()->activateChildAlgorithm( child->childId() ) )
    {
      emit requestModelRepaint();
    }
    else
    {
      QMessageBox::warning(
        nullptr,
        QObject::tr( "Could not activate algorithm" ),
        QObject::tr(
          "The selected algorithm depends on other currently non-active algorithms.\n"
          "Activate them them before trying to activate it.."
        )
      );
    }
  }
}
 
 
QgsModelOutputGraphicItem::QgsModelOutputGraphicItem( QgsProcessingModelOutput *output, QgsProcessingModelAlgorithm *model, QGraphicsItem *parent )
  : QgsModelComponentGraphicItem( output, model, parent )
{
  QSvgRenderer svg( QgsApplication::iconPath( u"mIconModelOutput.svg"_s ) );
  QPainter painter( &mPicture );
  svg.render( &painter );
  painter.end();
  setLabel( output->description() );
}
 
QColor QgsModelOutputGraphicItem::fillColor( QgsModelComponentGraphicItem::State state ) const
{
  QColor c( 172, 196, 114 );
  switch ( state )
  {
    case Selected:
      c = c.darker( 110 );
      break;
    case Hover:
      c = c.darker( 105 );
      break;
 
    case Normal:
      break;
  }
  return c;
}
 
QColor QgsModelOutputGraphicItem::strokeColor( QgsModelComponentGraphicItem::State state ) const
{
  switch ( state )
  {
    case Selected:
      return QColor( 42, 65, 42 );
    case Hover:
    case Normal:
      return QColor( 90, 140, 90 );
  }
  return QColor();
}
 
QColor QgsModelOutputGraphicItem::textColor( QgsModelComponentGraphicItem::State ) const
{
  return Qt::black;
}
 
QPicture QgsModelOutputGraphicItem::iconPicture() const
{
  return mPicture;
}
 
void QgsModelOutputGraphicItem::updateStoredComponentPosition( const QPointF &pos, const QSizeF &size )
{
  if ( QgsProcessingModelOutput *output = dynamic_cast<QgsProcessingModelOutput *>( component() ) )
  {
    model()->childAlgorithm( output->childId() ).modelOutput( output->name() ).setPosition( pos );
    model()->childAlgorithm( output->childId() ).modelOutput( output->name() ).setSize( size );
  }
}
 
bool QgsModelOutputGraphicItem::canDeleteComponent()
{
  if ( dynamic_cast<const QgsProcessingModelOutput *>( component() ) )
  {
    return true;
  }
  return false;
}
 
void QgsModelOutputGraphicItem::deleteComponent()
{
  if ( const QgsProcessingModelOutput *output = dynamic_cast<const QgsProcessingModelOutput *>( component() ) )
  {
    emit aboutToChange( tr( "Delete Output %1" ).arg( output->description() ) );
    model()->childAlgorithm( output->childId() ).removeModelOutput( output->name() );
    model()->updateDestinationParameters();
    emit changed();
    emit requestModelRepaint();
  }
}
 
 
//
// QgsModelGroupBoxGraphicItem
//
 
QgsModelGroupBoxGraphicItem::QgsModelGroupBoxGraphicItem( QgsProcessingModelGroupBox *box, QgsProcessingModelAlgorithm *model, QGraphicsItem *parent )
  : QgsModelComponentGraphicItem( box, model, parent )
{
  setZValue( QgsModelGraphicsScene::ZValues::GroupBox );
  setLabel( box->description() );
 
  QFont f = font();
  f.setBold( true );
  f.setPixelSize( 14 );
  setFont( f );
}
 
void QgsModelGroupBoxGraphicItem::contextMenuEvent( QGraphicsSceneContextMenuEvent *event )
{
  QMenu *popupmenu = new QMenu( event->widget() );
  QAction *removeAction = popupmenu->addAction( QObject::tr( "Remove" ) );
  connect( removeAction, &QAction::triggered, this, &QgsModelGroupBoxGraphicItem::deleteComponent );
  QAction *editAction = popupmenu->addAction( QObject::tr( "Edit…" ) );
  connect( editAction, &QAction::triggered, this, &QgsModelGroupBoxGraphicItem::editComponent );
  popupmenu->exec( event->screenPos() );
}
 
QgsModelGroupBoxGraphicItem::~QgsModelGroupBoxGraphicItem() = default;
 
QColor QgsModelGroupBoxGraphicItem::fillColor( QgsModelComponentGraphicItem::State state ) const
{
  QColor c( 230, 230, 230 );
  switch ( state )
  {
    case Selected:
      c = c.darker( 110 );
      break;
    case Hover:
      c = c.darker( 105 );
      break;
 
    case Normal:
      break;
  }
  return c;
}
 
QColor QgsModelGroupBoxGraphicItem::strokeColor( QgsModelComponentGraphicItem::State state ) const
{
  switch ( state )
  {
    case Selected:
      return QColor( 50, 50, 50 );
    case Hover:
    case Normal:
      return QColor( 150, 150, 150 );
  }
  return QColor();
}
 
QColor QgsModelGroupBoxGraphicItem::textColor( QgsModelComponentGraphicItem::State ) const
{
  return QColor( 100, 100, 100 );
}
 
Qt::PenStyle QgsModelGroupBoxGraphicItem::strokeStyle( QgsModelComponentGraphicItem::State ) const
{
  return Qt::DotLine;
}
 
Qt::Alignment QgsModelGroupBoxGraphicItem::titleAlignment() const
{
  return Qt::AlignHCenter;
}
 
void QgsModelGroupBoxGraphicItem::updateStoredComponentPosition( const QPointF &pos, const QSizeF &size )
{
  if ( QgsProcessingModelGroupBox *box = dynamic_cast<QgsProcessingModelGroupBox *>( component() ) )
  {
    box->setPosition( pos );
    box->setSize( size );
    model()->addGroupBox( *box );
  }
}
 
bool QgsModelGroupBoxGraphicItem::canDeleteComponent()
{
  if ( dynamic_cast<QgsProcessingModelGroupBox *>( component() ) )
  {
    return true;
  }
  return false;
}
 
void QgsModelGroupBoxGraphicItem::applyEdit( const QgsProcessingModelGroupBox &groupBox )
{
  QgsProcessingModelGroupBox newGroupBox = groupBox;
  const QList<QgsProcessingModelGroupBox> existingGroupBoxes = model()->groupBoxes();
  for ( const QgsProcessingModelGroupBox &existingGroupBox : existingGroupBoxes )
  {
    if ( existingGroupBox.uuid() == newGroupBox.uuid() )
    {
      // copy position and size from existing group box
      newGroupBox.setPosition( existingGroupBox.position() );
      newGroupBox.setSize( existingGroupBox.size() );
    }
  }
 
  const QString commandId = u"groupbox:%1"_s.arg( newGroupBox.uuid() );
  emit aboutToChange( tr( "Edit Group Box" ), commandId );
 
  model()->addGroupBox( newGroupBox );
  emit changed();
  emit requestModelRepaint();
}
 
void QgsModelGroupBoxGraphicItem::deleteComponent()
{
  if ( const QgsProcessingModelGroupBox *box = dynamic_cast<const QgsProcessingModelGroupBox *>( component() ) )
  {
    emit aboutToChange( tr( "Delete Group Box" ) );
    model()->removeGroupBox( box->uuid() );
    emit changed();
    emit requestModelRepaint();
  }
}
 
void QgsModelGroupBoxGraphicItem::editComponent()
{
  if ( const QgsProcessingModelGroupBox *box = dynamic_cast<const QgsProcessingModelGroupBox *>( component() ) )
  {
    QgsModelGroupBoxDefinitionDialog dlg( *box, this->scene()->views().at( 0 ) );
 
    if ( dlg.exec() )
    {
      applyEdit( dlg.groupBox() );
    }
  }
}
 
//
// QgsModelCommentGraphicItem
//
 
QgsModelCommentGraphicItem::QgsModelCommentGraphicItem( QgsProcessingModelComment *comment, QgsModelComponentGraphicItem *parentItem, QgsProcessingModelAlgorithm *model, QGraphicsItem *parent )
  : QgsModelComponentGraphicItem( comment, model, parent )
  , mParentComponent( parentItem->component()->clone() )
  , mParentItem( parentItem )
{
  setLabel( comment->description() );
 
  QFont f = font();
  f.setPixelSize( 9 );
  setFont( f );
}
 
void QgsModelCommentGraphicItem::contextMenuEvent( QGraphicsSceneContextMenuEvent *event )
{
  QMenu *popupmenu = new QMenu( event->widget() );
  QAction *removeAction = popupmenu->addAction( QObject::tr( "Remove" ) );
  connect( removeAction, &QAction::triggered, this, &QgsModelCommentGraphicItem::deleteComponent );
  QAction *editAction = popupmenu->addAction( QObject::tr( "Edit…" ) );
  connect( editAction, &QAction::triggered, this, &QgsModelCommentGraphicItem::editComponent );
  popupmenu->exec( event->screenPos() );
}
 
QgsModelCommentGraphicItem::~QgsModelCommentGraphicItem() = default;
 
QColor QgsModelCommentGraphicItem::fillColor( QgsModelComponentGraphicItem::State state ) const
{
  QColor c( 230, 230, 230 );
  switch ( state )
  {
    case Selected:
      c = c.darker( 110 );
      break;
    case Hover:
      c = c.darker( 105 );
      break;
 
    case Normal:
      break;
  }
  return c;
}
 
QColor QgsModelCommentGraphicItem::strokeColor( QgsModelComponentGraphicItem::State state ) const
{
  switch ( state )
  {
    case Selected:
      return QColor( 50, 50, 50 );
    case Hover:
    case Normal:
      return QColor( 150, 150, 150 );
  }
  return QColor();
}
 
QColor QgsModelCommentGraphicItem::textColor( QgsModelComponentGraphicItem::State ) const
{
  return QColor( 100, 100, 100 );
}
 
Qt::PenStyle QgsModelCommentGraphicItem::strokeStyle( QgsModelComponentGraphicItem::State ) const
{
  return Qt::DotLine;
}
 
void QgsModelCommentGraphicItem::updateStoredComponentPosition( const QPointF &pos, const QSizeF &size )
{
  if ( QgsProcessingModelComment *comment = modelComponent() )
  {
    comment->setPosition( pos );
    comment->setSize( size );
  }
}
 
bool QgsModelCommentGraphicItem::canDeleteComponent()
{
  if ( modelComponent() )
  {
    return true;
  }
  return false;
}
 
void QgsModelCommentGraphicItem::deleteComponent()
{
  if ( QgsProcessingModelComment *comment = modelComponent() )
  {
    emit aboutToChange( tr( "Delete Comment" ) );
    comment->setDescription( QString() );
    emit changed();
    emit requestModelRepaint();
  }
}
 
void QgsModelCommentGraphicItem::editComponent()
{
  if ( mParentItem )
  {
    mParentItem->editComment();
  }
}
 
QgsProcessingModelComment *QgsModelCommentGraphicItem::modelComponent()
{
  if ( const QgsProcessingModelChildAlgorithm *child = dynamic_cast<const QgsProcessingModelChildAlgorithm *>( mParentComponent.get() ) )
  {
    return model()->childAlgorithm( child->childId() ).comment();
  }
  else if ( const QgsProcessingModelParameter *param = dynamic_cast<const QgsProcessingModelParameter *>( mParentComponent.get() ) )
  {
    return model()->parameterComponent( param->parameterName() ).comment();
  }
  else if ( const QgsProcessingModelOutput *output = dynamic_cast<const QgsProcessingModelOutput *>( mParentComponent.get() ) )
  {
    return model()->childAlgorithm( output->childId() ).modelOutput( output->name() ).comment();
  }
  return nullptr;
}
 
QgsModelComponentGraphicItem *QgsModelCommentGraphicItem::parentComponentItem() const
{
  return mParentItem;
}